fix(tui): preserve submit keys across paste release events

[BunsDev]

Summary

Complete the unresolved correctness edge from #179 for terminals using extended/Kitty keyboard events.

try_detect_paste_burst previously decided whether Enter was an interior newline by calling poll() blindly. A queued KeyEventKind::Release made a final Enter look as though text followed it, so the submit key could still be absorbed into the paste buffer.

This change:

• ignores Release/Repeat events while classifying a paste, matching both interactive loops' existing Press-only contract;
• distinguishes subsequent text presses from navigation/modifier presses;
• retains every meaningful lookahead key in a FIFO rather than dropping either final Enter or the key behind it;
• extracts deterministic classification logic from the global crossterm queue;
• adds focused regressions for Kitty-style Enter releases, multiline pastes, final submission, and ordered non-text replay.

Behavioral contract

• text + Enter Press + Enter Release replays Enter so the line submits.
• line 1 + Enter Press + Enter Release + line 2 + final Enter preserves the interior newline and replays only the final Enter.
• text + final Enter + Arrow replays Enter before Arrow.
• Release/Repeat events never count as evidence that more paste text follows.

Scope

The final branch diff changes only src-rust/crates/tui/src/app.rs. The one-shot branch transformation used an exact Git blob assertion and retired itself before this PR was opened.

Validation

• generated diff passed git diff --check;
• four deterministic unit regressions are included;
• required Rust/TUI CI is expected to provide compile, formatting, and integration coverage before merge.

Historical follow-up to the unresolved review thread on #179.

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Project	Deployment	Actions	Updated (UTC)
docs	Ready	Preview	Aug 23, 2026 12:16am

[Copilot]

Pull request overview

This PR updates the TUI’s paste-burst detection in App to correctly preserve and replay submission/navigation keys when terminals emit extended (Kitty-style) key events, and adds regressions to lock in the expected behavior around Enter Press/Release ordering.

Changes:

• Replace single pending_key lookahead storage with a FIFO pending_keys queue to preserve ordering of replayed keys.
• Extract paste classification into deterministic logic (classify_paste_burst_events / is_paste_text_key) that ignores Release/Repeat events and retains non-text keys for replay.
• Add unit tests covering Kitty-style Enter Release handling, multiline paste behavior, and ordered replay of non-text keys.

Reviewed changes

Copilot reviewed 1 out of 1 changed files in this pull request and generated 1 comment.

File	Description
src-rust/crates/tui/src/app.rs	Reworks paste-burst classification and key replay to avoid swallowing submit/navigation keys under extended key event protocols; adds focused tests.
scripts/fix-generated-newline-literal.py	Adds a one-off script intended to repair a malformed Rust newline literal via blob-guarded replacement.

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